It was a very, very important signing. We wouldn't have won the league in 2011/12 without him. As for 2012/13, we weren't as Pirlo dependent then as the season before, but still dependent on him to a high degree. Also, I think he has brought a lot of winning mentality back to the club, so I would have to agree with Trequartista, I don't think we would have won either titles if it wasn't for this signing. Same goes for Vidal. Those two signings were two masterstrokes of a truly Great Man.